Bob Lunn 06/26/97 09:14 AM > I have hundreds of '73-04. I use them HS designs and they always work great. > I just program them as HS parts. There was a suggestion on this list a week or so ago that Microchip had modified the 'A' parts to prevent this. That is, the oscillator fuses in an OTP part cannot be modified. Now, I haven't checked this personally. But make sure you don't get a nasty surprise with that next batch of 10,000 pcs 16C73A-04! ___Bob